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</div></div></article><article class="postlist-item post"><header class="post-header"><h1 class="post-title"><a class="post-title__link" href="/2022/05/16/os1/">操作系统第一次作业相关讲解</a></h1><div class="post-meta"><span class="post-meta-item post-meta-item--createtime"><span class="post-meta-item__icon"><i class="far fa-calendar-plus"></i></span><span class="post-meta-item__info">发表于</span><span class="post-meta-item__value">2022-05-16</span></span><span class="post-meta-item post-meta-item--updatetime"><span class="post-meta-item__icon"><i class="far fa-calendar-check"></i></span><span class="post-meta-item__info">更新于</span><span class="post-meta-item__value">2022-05-16</span></span></div></header><div class="post-body"><div class="post-excerpt"><p>第1题：</p></div><div class="post-readmore"><a class="post-readmore__link" href="/2022/05/16/os1/"><span class="post-readmore__text">阅读全文</span><span class="post-readmore__icon"><i class="fas fa-long-arrow-alt-right"></i></span></a></div></div></article><article class="postlist-item post"><header class="post-header"><h1 class="post-title"><a class="post-title__link" href="/2022/04/14/java-GUI8/">Java-GUI编程之ImageIO的使用</a></h1><div class="post-meta"><span class="post-meta-item post-meta-item--createtime"><span class="post-meta-item__icon"><i class="far fa-calendar-plus"></i></span><span class="post-meta-item__info">发表于</span><span class="post-meta-item__value">2022-04-14</span></span><span class="post-meta-item post-meta-item--updatetime"><span class="post-meta-item__icon"><i class="far fa-calendar-check"></i></span><span class="post-meta-item__info">更新于</span><span class="post-meta-item__value">2023-05-13</span></span></div></header><div class="post-body"><div class="post-excerpt"><p>在实际生活中，很多软件都支持打开本地磁盘已经存在的图片，然后进行编辑，编辑完毕后，再重新保存到本地磁盘。如果使用AWT要完成这样的功能，那么需要使用到ImageIO这个类，可以操作本地磁盘的图片文件。</p></div><div class="post-readmore"><a class="post-readmore__link" href="/2022/04/14/java-GUI8/"><span class="post-readmore__text">阅读全文</span><span class="post-readmore__icon"><i class="fas fa-long-arrow-alt-right"></i></span></a></div></div></article><article class="postlist-item post"><header class="post-header"><h1 class="post-title"><a class="post-title__link" href="/2022/04/13/java-GUI7/">Java-GUI编程之处理位图</a></h1><div class="post-meta"><span class="post-meta-item post-meta-item--createtime"><span class="post-meta-item__icon"><i class="far fa-calendar-plus"></i></span><span class="post-meta-item__info">发表于</span><span class="post-meta-item__value">2022-04-13</span></span><span class="post-meta-item post-meta-item--updatetime"><span class="post-meta-item__icon"><i class="far fa-calendar-check"></i></span><span class="post-meta-item__info">更新于</span><span class="post-meta-item__value">2022-04-13</span></span></div></header><div class="post-body"><div class="post-excerpt"><p>如果仅仅绘制一些简单的几何图形，程序的图形效果依然比较单调 。 AWT 也允许在组件上绘制位图， Graphics 提供了 drawlmage() 方法用于绘制位图，该方法需要一个Image参数一一代表位图，通过该方法就可 以绘制出指定的位图 。</p></div><div class="post-readmore"><a class="post-readmore__link" href="/2022/04/13/java-GUI7/"><span class="post-readmore__text">阅读全文</span><span class="post-readmore__icon"><i class="fas fa-long-arrow-alt-right"></i></span></a></div></div></article><article class="postlist-item post"><header class="post-header"><h1 class="post-title"><a class="post-title__link" href="/2022/04/11/complexity/">时间复杂度与空间复杂度</a></h1><div class="post-meta"><span class="post-meta-item post-meta-item--createtime"><span class="post-meta-item__icon"><i class="far fa-calendar-plus"></i></span><span class="post-meta-item__info">发表于</span><span class="post-meta-item__value">2022-04-11</span></span><span class="post-meta-item post-meta-item--updatetime"><span class="post-meta-item__icon"><i class="far fa-calendar-check"></i></span><span class="post-meta-item__info">更新于</span><span class="post-meta-item__value">2022-04-11</span></span></div></header><div class="post-body"><div class="post-excerpt"><h1 id="复杂度分析"   >
          <a href="#复杂度分析" class="heading-link"><i class="fas fa-link"></i></a><a href="#复杂度分析" class="headerlink" title="复杂度分析"></a>复杂度分析</h1>
      <p>复杂度分析在我看来是数据结构与算法学习入门知识，尤为重要。</p>
<p>为什么复杂度分析重要？</p>
<p>数据结构与算法的出现本就是为了花更少的时间和空间（储存）来解决问题。复杂度分析就是为解决如何“花更少的时间和空间（储存）”的问题。</p></div><div class="post-readmore"><a class="post-readmore__link" href="/2022/04/11/complexity/"><span class="post-readmore__text">阅读全文</span><span class="post-readmore__icon"><i class="fas fa-long-arrow-alt-right"></i></span></a></div></div></article><article class="postlist-item post"><header class="post-header"><h1 class="post-title"><a class="post-title__link" href="/2022/04/08/java-GUI6/">Java-GUI编程之弹球小游戏</a></h1><div class="post-meta"><span class="post-meta-item post-meta-item--createtime"><span class="post-meta-item__icon"><i class="far fa-calendar-plus"></i></span><span class="post-meta-item__info">发表于</span><span class="post-meta-item__value">2022-04-08</span></span><span class="post-meta-item post-meta-item--updatetime"><span class="post-meta-item__icon"><i class="far fa-calendar-check"></i></span><span class="post-meta-item__info">更新于</span><span class="post-meta-item__value">2022-04-08</span></span></div></header><div class="post-body"><div class="post-excerpt"><p>Java也可用于开发一些动画。所谓动画，就是间隔一定的时间(通常小于0 . 1秒 )重新绘制新的图像，两次绘制的图像之间差异较小，肉眼看起来就成了所谓的动画 。   </p>
<p>​为了实现间隔一定的时间就重新调用组件的 repaint()方法，可以借助于 Swing 提供的Timer类，Timer类是一个定时器， 它有如下一个构造器 ：<br>Timer(int delay, ActionListener listener): 每间隔 delay 毫秒，系统自动触发 ActionListener 监听器里的事件处理器方法，在方法内部我们就可以调用组件的repaint方法，完成组件重绘。</p></div><div class="post-readmore"><a class="post-readmore__link" href="/2022/04/08/java-GUI6/"><span class="post-readmore__text">阅读全文</span><span class="post-readmore__icon"><i class="fas fa-long-arrow-alt-right"></i></span></a></div></div></article><article class="postlist-item post"><header class="post-header"><h1 class="post-title"><a class="post-title__link" href="/2022/04/08/java-GUI5/">Java-GUI编程之绘图</a></h1><div class="post-meta"><span class="post-meta-item post-meta-item--createtime"><span class="post-meta-item__icon"><i class="far fa-calendar-plus"></i></span><span class="post-meta-item__info">发表于</span><span class="post-meta-item__value">2022-04-08</span></span><span class="post-meta-item post-meta-item--updatetime"><span class="post-meta-item__icon"><i class="far fa-calendar-check"></i></span><span class="post-meta-item__info">更新于</span><span class="post-meta-item__value">2022-04-08</span></span></div></header><div class="post-body"><div class="post-excerpt"><h1 id="绘图"   >
          <a href="#绘图" class="heading-link"><i class="fas fa-link"></i></a><a href="#绘图" class="headerlink" title="绘图"></a>绘图</h1>
      <p>很多程序如各种小游戏都需要在窗口中绘制各种图形，除此之外，即使在开发JavaEE项目时，有时候也必须”动态”地向客户 端生成各种图形、图表，比如 图形验证码、统计图等，这都需要利用AWT的绘图功能。</p></div><div class="post-readmore"><a class="post-readmore__link" href="/2022/04/08/java-GUI5/"><span class="post-readmore__text">阅读全文</span><span class="post-readmore__icon"><i class="fas fa-long-arrow-alt-right"></i></span></a></div></div></article><article class="postlist-item post"><header class="post-header"><h1 class="post-title"><a class="post-title__link" href="/2022/04/07/java-GUI4/">Java-GUI编程之菜单组件</a></h1><div class="post-meta"><span class="post-meta-item post-meta-item--createtime"><span class="post-meta-item__icon"><i class="far fa-calendar-plus"></i></span><span class="post-meta-item__info">发表于</span><span class="post-meta-item__value">2022-04-07</span></span><span class="post-meta-item post-meta-item--updatetime"><span class="post-meta-item__icon"><i class="far fa-calendar-check"></i></span><span class="post-meta-item__info">更新于</span><span class="post-meta-item__value">2022-04-07</span></span></div></header><div class="post-body"><div class="post-excerpt"><p>前面讲解了如果构建GUI界面，其实就是把一些GUI的组件，按照一定的布局放入到容器中展示就可以了。在实际开发中，除了主界面，还有一类比较重要的内容就是菜单相关组件，可以通过菜单相关组件很方便的使用特定的功能，在AWT中，菜单相关组件的使用和之前学习的组件是一模一样的，只需要把菜单条、菜单、菜单项组合到一起，按照一定的布局，放入到容器中即可。</p></div><div class="post-readmore"><a class="post-readmore__link" href="/2022/04/07/java-GUI4/"><span class="post-readmore__text">阅读全文</span><span class="post-readmore__icon"><i class="fas fa-long-arrow-alt-right"></i></span></a></div></div></article><article class="postlist-item post"><header class="post-header"><h1 class="post-title"><a class="post-title__link" href="/2022/04/06/java-GUI3/">java-GUI编程之事件处理</a></h1><div class="post-meta"><span class="post-meta-item post-meta-item--createtime"><span class="post-meta-item__icon"><i class="far fa-calendar-plus"></i></span><span class="post-meta-item__info">发表于</span><span class="post-meta-item__value">2022-04-06</span></span><span class="post-meta-item post-meta-item--updatetime"><span class="post-meta-item__icon"><i class="far fa-calendar-check"></i></span><span class="post-meta-item__info">更新于</span><span class="post-meta-item__value">2022-04-06</span></span></div></header><div class="post-body"><div class="post-excerpt"><h1 id="事件处理"   >
          <a href="#事件处理" class="heading-link"><i class="fas fa-link"></i></a><a href="#事件处理" class="headerlink" title="事件处理"></a>事件处理</h1>
      <p>前面介绍了如何放置各种组件，从而得到了丰富多彩的图形界面，但这些界面还不能响应用户的任何操作。比如单击前面所有窗口右上角的“X”按钮，但窗口依然不会关闭。因为在 AWT 编程中 ，所有用户的操作，都必须都需要经过一套事件处理机制来完成，而 Frame 和组件本身并没有事件处理能力 。</p></div><div class="post-readmore"><a class="post-readmore__link" href="/2022/04/06/java-GUI3/"><span class="post-readmore__text">阅读全文</span><span class="post-readmore__icon"><i class="fas fa-long-arrow-alt-right"></i></span></a></div></div></article><article class="postlist-item post"><header class="post-header"><h1 class="post-title"><a class="post-title__link" href="/2022/04/05/java-GUI2/">java-GUI编程之AWT组件</a></h1><div class="post-meta"><span class="post-meta-item post-meta-item--createtime"><span class="post-meta-item__icon"><i class="far fa-calendar-plus"></i></span><span class="post-meta-item__info">发表于</span><span class="post-meta-item__value">2022-04-05</span></span><span class="post-meta-item post-meta-item--updatetime"><span class="post-meta-item__icon"><i class="far fa-calendar-check"></i></span><span class="post-meta-item__info">更新于</span><span class="post-meta-item__value">2022-04-05</span></span></div></header><div class="post-body"><div class="post-excerpt"><h1 id="AWT中常用组件"   >
          <a href="#AWT中常用组件" class="heading-link"><i class="fas fa-link"></i></a><a href="#AWT中常用组件" class="headerlink" title="AWT中常用组件"></a>AWT中常用组件</h1>
      
        <h2 id="基本组件"   >
          <a href="#基本组件" class="heading-link"><i class="fas fa-link"></i></a><a href="#基本组件" class="headerlink" title="基本组件"></a>基本组件</h2></div><div class="post-readmore"><a class="post-readmore__link" href="/2022/04/05/java-GUI2/"><span class="post-readmore__text">阅读全文</span><span class="post-readmore__icon"><i class="fas fa-long-arrow-alt-right"></i></span></a></div></div></article></section><nav class="paginator"><div class="paginator-inner"><span class="page-number current">1</span><a class="page-number" href="/page/2/">2</a><a class="page-number" href="/page/3/">3</a><a class="extend next" rel="next" href="/page/2/"><i class="fas fa-angle-right"></i></a></div></nav></div></div><div class="sidebar-wrap" id="sidebar-wrap"><aside class="sidebar" id="sidebar"><section class="sidebar-toc hide"></section><!-- ov = overview--><section class="sidebar-ov"><div class="sidebar-ov-author"><div class="sidebar-ov-author__avatar"><img class="sidebar-ov-author__avatar_img" src="https://s4.ax1x.com/2022/01/03/Tb2VW6.png" alt="avatar"></div><p class="sidebar-ov-author__text">格物致知，知行合一</p></div><div class="sidebar-ov-social"><a class="sidebar-ov-social-item" href="https://s4.ax1x.com/2022/01/03/Tb8ZB4.png" target="_blank" rel="noopener" data-popover="微信" data-popover-pos="up"><span class="sidebar-ov-social-item__icon"><i class="fab fa-weixin"></i></span></a><a class="sidebar-ov-social-item" href="mailto:lklong@88.com" target="_blank" rel="noopener" data-popover="social.Email" data-popover-pos="up"><span class="sidebar-ov-social-item__icon">lklong@88.com</span></a></div><div class="sidebar-ov-cc"><a href="https://creativecommons.org/licenses/by-nc-sa/4.0/deed.en" target="_blank" rel="noopener" data-popover="知识共享许可协议" data-popover-pos="up"><img src="/images/cc-by-nc-sa.svg"></a></div></section></aside></div><div class="clearfix"></div></div></main><footer class="footer" id="footer"><div class="footer-inner"><div><span>Copyright © 2023</span><span class="footer__icon"><i class="fas fa-heart"></i></span><span>愷龍 All Rights Reserved</span></div><div><span>由 <a href="http://hexo.io/" title="Hexo" target="_blank" rel="noopener">Hexo</a> 强力驱动</span><span> v5.4.0</span><span class="footer__devider">|</span><span>主题 - <a href="https://github.com/liuyib/hexo-theme-stun/" title="Stun" target="_blank" rel="noopener">Stun</a></span><span> v2.6.2</span></div></div></footer><div class="loading-bar" id="loading-bar"><div class="loading-bar__progress"></div></div><div class="back2top" id="back2top"><span class="back2top__icon"><i class="fas fa-rocket"></i></span></div></div><div class="search-mask"></div><div class="search-popup"><span class="search-close"></span><div class="search-input"><input placeholder="搜索文章（支持多关键词，请用空格分隔）"></div><div class="search-results"></div></div><script src="https://cdn.jsdelivr.net/npm/jquery@v3.4.1/dist/jquery.min.js"></script><script src="https://cdn.jsdelivr.net/npm/velocity-animate@1.5.2/velocity.min.js"></script><script src="https://cdn.jsdelivr.net/npm/velocity-animate@1.5.2/velocity.ui.min.js"></script><script>function initSearch() {
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        }
        // 防止未输入字符时搜索
        if (searchText.length > 0) {
          datas.forEach(function (data) {
            var isMatch  = false;
            // 没有标题的文章使用预设的 i18n 变量代替
            var title = (data.title && data.title.trim()) || '[ 文章无标题 ]';
            var titleLower = title && title.toLowerCase();
            // 删除 HTML 标签 和 所有空白字符
            var content = data.content && data.content.replace(/<[^>]+>/g, '');
            var contentLower = content && content.toLowerCase();
            // 删除重复的 /
            var postURL = data.url && decodeURI(data.url).replace(/\/{2,}/g, '/');
            // 标题中匹配到的关键词
            var titleHitSlice = [];
            // 内容中匹配到的关键词
            var contentHitSlice = [];

            keywords.forEach(function (keyword) {
              /**
              * 获取匹配的关键词的索引
              * @param {String} keyword 要匹配的关键字
              * @param {String} text 原文字
              * @param {Boolean} caseSensitive 是否区分大小写
              * @param {Number} weight 匹配对象的权重。权重大的优先显示
              * @return {Array}
              */
              function getIndexByword (word, text, caseSensitive, weight) {
                if (!word || !text) {
                  return [];
                };

                var startIndex = 0; // 每次匹配的开始索引
                var index = -1;     // 匹配到的索引值
                var result = [];    // 匹配结果

                if (!caseSensitive) {
                  word = word.toLowerCase();
                  text = text.toLowerCase();
                }

                while((index = text.indexOf(word, startIndex)) !== -1) {
                  var hasMatch = false;
                  // 索引位置相同的关键词，保留长度较长的
                  titleHitSlice.forEach(function (hit) {
                    if (hit.index === index && hit.word.length < word.length) {
                      hit.word = word;
                      hasMatch = true;
                    }
                  });
                  startIndex = index + word.length;
                  !hasMatch && result.push({ index: index, word: word, weight: weight });
                }
                return result;
              }
              titleHitSlice = titleHitSlice.concat(getIndexByword(keyword, titleLower, false, WEIGHT.title));
              contentHitSlice = contentHitSlice.concat(getIndexByword(keyword, contentLower, false, WEIGHT.content));
            });

            var hitTitle = titleHitSlice.length;
            var hitContent = contentHitSlice.length;

            if (hitTitle > 0 || hitContent > 0) {
              isMatch = true;
            }
            if (isMatch) {
              ;[titleHitSlice, contentHitSlice].forEach(function (hit) {
                // 按照匹配文字的索引的递增顺序排序
                hit.sort(function (left, right) {
                  return left.index - right.index;
                });
              });
              /**
              * 给文本中匹配到的关键词添加标记，从而进行高亮显示
              * @param {String} text 原文本
              * @param {Array} hitSlice 匹配项的索引信息
              * @param {Number} start 开始索引
              * @param {Number} end 结束索引
              * @return {String}
              */
              function highlightKeyword (text, hitSlice, start, end) {
                if (!text || !hitSlice || !hitSlice.length) {
                  return;
                }

                var result = '';
                var startIndex = start;
                var endIndex = end;
                hitSlice.forEach(function (hit) {
                  if (hit.index < startIndex) {
                    return;
                  }

                  var hitWordEnd = hit.index + hit.word.length;
                  result += text.slice(startIndex, hit.index);
                  result += '<b>' + text.slice(hit.index, hitWordEnd) + '</b>';
                  startIndex = hitWordEnd;
                });
                result += text.slice(startIndex, endIndex);
                return result;
              }

              var postData = {};
              // 文章总的搜索权重
              var postWeight = titleHitSlice.length * WEIGHT.title + contentHitSlice.length * WEIGHT.content;
              // 标记匹配关键词后的标题
              var postTitle = highlightKeyword(title, titleHitSlice, 0, title.length) || title;
              // 标记匹配关键词后的内容
              var postContent;
              // 显示内容的长度
              var SHOW_WORD_LENGTH = 200;
              // 命中关键词前的字符显示长度
              var SHOW_WORD_FRONT_LENGTH = 20;
              var SHOW_WORD_END_LENGTH = SHOW_WORD_LENGTH - SHOW_WORD_FRONT_LENGTH;

              // 截取匹配的第一个字符，前后共 200 个字符来显示
              if (contentHitSlice.length > 0) {
                var firstIndex = contentHitSlice[0].index;
                var start = firstIndex > SHOW_WORD_FRONT_LENGTH ? firstIndex - SHOW_WORD_FRONT_LENGTH : 0;
                var end = firstIndex + SHOW_WORD_END_LENGTH;
                postContent = highlightKeyword(content, contentHitSlice, start, end);
              } else { // 未匹配到内容，直接截取前 200 个字符来显示
                postContent = content.slice(0, SHOW_WORD_LENGTH);
              }
              postData.title = postTitle;
              postData.content = postContent;
              postData.url = postURL;
              postData.weight = postWeight;
              matchPosts.push(postData);
            }
          });
        }

        var resultInnerHtml = '';
        if (matchPosts.length) {
          // 按权重递增的顺序排序，使权重大的优先显示
          matchPosts.sort(function (left, right) {
            return right.weight - left.weight;
          });
          resultInnerHtml += '<ul>';
          matchPosts.forEach(function (post) {
            resultInnerHtml += '<li><a class="search-results-title" href="' + post.url + '">';
            resultInnerHtml += post.title;
            resultInnerHtml += '</a><div class="search-results-content">';
            resultInnerHtml += post.content;
            resultInnerHtml += '</div></li>';
          });
          resultInnerHtml += '</ul>';
        } else {
          resultInnerHtml += '<div class="search-results-none"><i class="far fa-meh"></i></div>';
        }
        $result.html(resultInnerHtml);
      };
      $input.on('input', searchPost);
      $input.on('keyup', function (e) {
        if (e.keyCode === Stun.utils.codeToKeyCode('Enter')) {
          searchPost();
        }
      });
    }
  });
}

function closeSearch () {
  $('body').css({ overflow: 'auto' });
  $('.search-popup').css({ display: 'none' });
  $('.search-mask').css({ display: 'none' });
}

window.addEventListener('DOMContentLoaded', function () {
  Stun.utils.pjaxReloadLocalSearch = function () {
    $('.header-nav-search').on('click', function (e) {
      e.stopPropagation();
      $('body').css('overflow', 'hidden');
      $('.search-popup')
        .velocity('stop')
        .velocity('transition.expandIn', {
          duration: 300,
          complete: function () {
            $('.search-popup input').focus();
          }
        });
      $('.search-mask')
        .velocity('stop')
        .velocity('transition.fadeIn', {
          duration: 300
        });

      initSearch();
    });
    $('.search-mask, .search-close').on('click', function () {
      closeSearch();
    });
    $(document).on('keydown', function (e) {
      // Escape <=> 27
      if (e.keyCode === Stun.utils.codeToKeyCode('Escape')) {
        closeSearch();
      }
    });
  };

  Stun.utils.pjaxReloadLocalSearch();
}, false);

function safeOpenUrl(url) {
  var newTab = window.open();
  newTab.opener = null;
  newTab.location = url;
}

function extSearch(engine) {
  var engines = {
    google: 'https://www.google.com/search?q=',
    bing: 'https://cn.bing.com/search?q=',
    baidu: 'https://www.baidu.com/s?ie=UTF-8&wd=',
  };
  var host = window.location.host;
  var query = $('.search-input input').val().toLowerCase().trim();
  var uri = engines[engine] + query + ' site:' + host;

  if (query) {
    safeOpenUrl(uri);
  } else {
    Stun.utils.popAlert('warning', '请输入字符');
  }
}

var assistSearchList = window.CONFIG.assistSearch;

if (Array.isArray(assistSearchList)) {
  assistSearchList.forEach(function (name) {
    document.querySelector('.search-btns-item--' + name).addEventListener('click', function () {
      extSearch(name);
    }, false);
  });
}</script><script src="/js/utils.js?v=2.6.2"></script><script src="/js/stun-boot.js?v=2.6.2"></script><script src="/js/scroll.js?v=2.6.2"></script><script src="/js/header.js?v=2.6.2"></script><script src="/js/sidebar.js?v=2.6.2"></script><script type="application/json" src="/search.xml"></script></body></html>